A CFI'S RPT ON AN INFLT ENG STOPPAGE ON HIS BEECH 23 SUN DOWNER THAT WAS OVERCOME BY PUMPING THE THROTTLE FOR A RESTART WHILE MAKING AN EMER LNDG NEAR ROA; VA.

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CONDUCTING PART 91 FLT TRAINING FOR LCL PUBLIC HIGH SCHOOL SYS WITH STUDENT; PRACTICING PWR OFF (APCH TO LNDG) STALLS; AIRPLANE STALLED AND WHEN RECOVERY ATTEMPTED; IE; FULL PWR APPLIED; ENG QUIT. I (CFI) TOOK OVER CTL OF ACFT AND PERFORMED EMER ENG OUT CHKLIST; TO NO AVAIL. AFTER SECOND ATTEMPT TO RESTART WAS UNSUCCESSFUL; CALLED ROA APCH CTL AND DECLARED A MAYDAY; SQUAWKED 7700. NOW AT 2500 FT MSL (1300 FT AGL) HEADING FOR A GRASS FIELD; TRIED PROCS NOT INCLUDED IN ENG OUT/RESTART CHKLIST: PUMPED THROTTLE AND ENG FIRED/RESTARTED. PROCEEDED TO ROA WHILE GAINING AS MUCH ALT AS POSSIBLE; SPIRALED DOWN AND LANDED WITHOUT INCIDENT. ATC (ROA APCH) PROVIDED ASSISTANCE AND SUGGESTIONS DURING EMER; PROVIDED PRIORITY HANDLING OVER OTHER ACFT INCLUDING CLRNC TO LAND ANY RWY. ACFT SUBSEQUENTLY INSPECTED BY MAINT FOUND LIMITED AMOUNT OF DEBRIS/WATER IN CARB BOWL; BUT BEST EXPLANATION OF PROB WAS DUE TO VAPOR LOCK IN MECHANICAL FUEL PUMP WITH ELECTRIC FUEL BOOST PUMP ON. ACFT RETURNED TO SVC. I HAVE ADVISED OTHER CFI'S AT THE SCHOOL OF THE PROB AND SUBSEQUENT UNSUCCESSFUL AND SUCCESSFUL RESTART PROCS FOR THEIR FUTURE USE IF NECESSARY.